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Analysis and simulation of dry-spot behavior in Liquid Composite Molding

Bertling, Dominic and Jose, Siby and Liebers, Nico (2018) Analysis and simulation of dry-spot behavior in Liquid Composite Molding. 14th International Conference on Flow Processes in Composite Materials, 30. Mai - 01. Juni 2018, Luleå, Sweden.

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Abstract

Due to industrial automation of liquid composite molding processes and increasing geometrical complexity of composite components, dry-spots from flow front junctions have become increasingly difficult to avoid. The impact and behavior of voids (microscopic gas entrapments) during preform impregnation in Liquid Composite Molding processes is well known but little attention is given to behavior of dry-spots (macroscopic gas entrapments). Experiments show, that formation of dry-spots in an early stage of an injection process does not necessarily lead to scrap parts. Therefore simulation based predictions of dry-spots are not a sufficient condition for bad injection strategies. Resolution mechanisms of dry-spots under controlled process conditions and the resulting findings of fundamental formation- and dispersion mechanisms are briefly presented. Parameters that have an influence on the diminishing rate of dry-spots have been identified and correspond to Darcys law. Consequently this paper presents a first approach of dry-spot size prediction, which shows good agreement with experimental results. The two-phase simulation is based on the pressure-saturation approach formulated using Darcy´s law. A relative permeability model takes into account the influence on the flow of each phase in the presence of the other phase.

Item URL in elib:https://elib.dlr.de/121958/
Document Type:Conference or Workshop Item (Speech)
Title:Analysis and simulation of dry-spot behavior in Liquid Composite Molding
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bertling, Dominicdominic.bertling (at) dlr.dehttps://orcid.org/0000-0003-1851-3333
Jose, Sibysiby.jose (at) tu-braunschweig.deUNSPECIFIED
Liebers, Niconico.liebers (at) dlr.dehttps://orcid.org/0000-0002-0124-896X
Date:1 June 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Dry-Spot; Two-phase simulation; Darcys law; Relative permeability models; Saturation; Air-fraction term; Liquid Composite Molding
Event Title:14th International Conference on Flow Processes in Composite Materials
Event Location:Luleå, Sweden
Event Type:international Conference
Event Dates:30. Mai - 01. Juni 2018
Organizer:Luleå University of Technology and Swerea SICOMP AB
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Composite Technology
Deposited By: Bertling, Dominic
Deposited On:22 Oct 2018 10:11
Last Modified:31 Jul 2019 20:19

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